Manufacturing method of polarizing property electrode for electrical double layer capacitor, and manufacturing method of electrode sheet for electrical double layer capacitor

a manufacturing method and technology for capacitors, applied in capacitor electrodes, electrolytic capacitors, liquid electrolytic capacitors, etc., can solve the problem that the above organic chemical compound scattering object (evaporated object) cannot easily stay in the atmosphere, and achieve the effect of reducing increasing the diffusion resistance between the activated carbon powder and the electrolyte, and being difficult to remov

Inactive Publication Date: 2005-03-29
HONDA MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In accordance with such a polarizing property electrode for the electrical double layer capacitor, since the concentration of the organic chemical compound included within the polarizing property electrode is set to 800 ppm or less (with respect to the weight of the sheet for an electrode), the amount of the organic chemical compound left within the minute hole of the activated carbon powder is small, and there is no fear that the formation of the electrical double layer using the adsorption of the electrolytic ion is prevented. Thus, the electrical double layer is sufficiently formed within the minute hole of the activated carbon powder, and the diffusion resistance between the activated carbon powder and the electrolyte is reduced.
When the concentration of the organic chemical compound exceeds 800 ppm (with respect to the weight of the sheet for an electrode), it is very difficult to usefully remove the organic chemical compound of the electrode body by heating and pressure reduction in the manufacture of the electrical double layer capacitor using such an electrode. As a result, it is not preferable since the formation of the electrical double layer using the adsorption of the electrolytic ion is prevented, and the diffusion resistance between the activated carbon powder and the electrolyte is increased, and electrode performance as the polarizing property electrode for the electrical double layer capacitor is reduced.
Further, the present invention is made in consideration of the above situation, and its object is to provide a manufacturing method of the electrode sheet for the electrical double layer capacitor able to set the remaining amount of moisture, etc. in the electrode sheet to a very low value and causing no electrolysis of water at the actual using time and able to maintain durability and reliability for a long period.

Problems solved by technology

Accordingly, a scattered object (evaporated object) of the above organic chemical compound does not easily stay within an atmosphere in the vicinity of the sheet surface for an electrode.

Method used

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  • Manufacturing method of polarizing property electrode for electrical double layer capacitor, and manufacturing method of electrode sheet for electrical double layer capacitor
  • Manufacturing method of polarizing property electrode for electrical double layer capacitor, and manufacturing method of electrode sheet for electrical double layer capacitor
  • Manufacturing method of polarizing property electrode for electrical double layer capacitor, and manufacturing method of electrode sheet for electrical double layer capacitor

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

(First Embodiment)

(Manufacture of Electrical Double Layer Capacitor of Embodiment 1)

First, the activated carbon powder is manufactured as follows. First, carbonization processing is performed by holding phenol resin within a nitrogen atmosphere at 900° C. for two hours. Next, when the obtained raw material carbon is again raised in temperature within the nitrogen current and reached 800° C., a nitrogen mixing gas including water vapor at 5% and carbon dioxide at 5% is circulated and held at 900° C. for two hours so that activation processing is performed. The obtained activated carbon is crushed by a ball mill crusher until the activated carbon had an average grain diameter of about 2 to 15 μm, and is set to activated carbon powder.

Next, an electrode molding process for kneading and molding the obtained activated carbon powder, a binding material (polytetrafluoroethylene) and an organic solvent for lubrication (isopropyl alcohol (IPA)) in a sheet shape is performed. Namely, 8 parts ...

second embodiment

(Second Embodiment)

(Manufacture of Electrical Double Layer Capacitor of Embodiment 2)

Similar to the case of the above Embodiment 1, the electrical double layer capacitor of Embodiment 2 is manufactured except that the electrode body sheet after the current collecting body adhering process is introduced into the continuous drying furnace of a hot air type, and the continuous drying (continuous drying process) is performed in the condition of blowing the hot air of 150° C. in temperature for four minutes at a flow rate of 10 L / minute, and the drying time in the vacuum drying process is set to 48 hours.

(Analysis of Organic Chemical Compound Amount Within Polarizing Property Electrode)

With respect to the Embodiment 2 and the Comparison Example 2 made in the above First Embodiment, one portion of the polarizing property electrode after the vacuum drying process is picked and heated for 60 minutes at 300° C. within a nitrogen gas current so that moisture within the electrode is set to wat...

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Abstract

In an electrode drying process in which the electrode is molded in a sheet shape by kneading activated carbon powder, a binding material and an organic solvent for lubrication and a polarizing property electrode is formed by heating and removing the organic solvent for lubrication in the molded electrode, the organic solvent for lubrication included in the electrode is removed in a state in which the above electrode is widened in the sheet shape. In a manufacturing method of an electrode sheet for the electrical double layer capacitor, continuous drying and vacuum drying are performed in a drying process.

Description

BACKGROUND OF THE INVENTIONThe present invention relates to a polarizing property electrode for an electrical double layer capacitor and its manufacturing method.Further, the present invention relates to a manufacturing method of an electrode sheet for an electrical double layer capacitor, and particularly relates to the improvement of a drying process for drying the electrode sheet.The electrical double layer capacitor has a large capacity of a farad class and is excellent in charge and discharge cycle characteristics. Therefore, the electrical double layer capacitor is used in uses such as a backup power source of an electric device, a battery mounted to a car, etc.This electrical double layer capacitor is constructed by arranging a pair of polarizing property electrodes, a separator arranged between the pair of polarizing property electrodes, and an electrolyte. The polarizing electrodes separated by the separator are constructed so as to respectively act as an anode and a cathod...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01G9/04H01L21/70H01L21/8242H01G9/00H01G9/058H01G9/155
CPCH01G9/058H01G9/155H01G11/86H01G11/38Y10T29/417Y02E60/13H01G11/28H01G11/22
Inventor IWAIDA, MANABUOYAMA, SHIGEKIMURAKAMI, KENICHISATO, KENJIOZAKI, KOUKITSUTSUI, MASANORI
Owner HONDA MOTOR CO LTD
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